Nowadays much attention has been paid to biodiesel, which is an alternative for petroleum based fuel, but the use of food resource for the feedstock is problematic. One of the possible solutions to reduce the utilization of the edible oil for biodiesel production is to use non-edible oils. Rubber seeds, which are by-product of tree for natural rubber production, are consists abundant oil. At present the rubber seeds oil (RSO) does not find any major applications, and categorized in non-edible type. Estimation of the potential of biodiesel using RSO is significant. In this seminar, I would like to introduce the estimation of the biodiesel production potential from rubber seed in natural rubber producer countries, based on experimental data.

Marine macroalgae, especially brown algae, absorb metal ions by alginic acid and sulfated polysaccharides. The biomass of brown algae is available in large quantities as renewable biological resources; however the abundant metals accumulate in marine biomass residues. To achieve metal recovery and seawater recycling, we focused on the ability of photosynthetic bacteria to tolerate heavy metals.

Marine photosynthetic bacteria were enriched with heavy metals and successfully obtained the bacterial communities harboring high-level resistance to a wide variety of heavy metal ions. Moreover, ten times equivalent of heavy metal ions that accumulated in kelp were recovered in harvested cells.

In subcritical water region, char is produced, causing reactor plugging and decreasing carbon gasification efficiency. However, measurement of heat of reaction has not been conducted under hydrothermal condition. The purpose of this study is to measure the heat of chemical reaction under hydrothermal condition with residence time and change of glucose concentration. The tendency of increase of the heat of reaction is different due to the difference in concentration from experimental results was found.